STMicroelectronics STM6524ALABDL6F

Overview

STM6524ALABDL6F from STMicroelectronics is a 6-pin Smart Reset™ supervisor IC designed for delayed, dual-button reset control in portable electronics. It features factory-programmed 6.0 s Smart Reset™ setup delay (tSRC), 360 ms fixed reset pulse duration (tREC), open-drain active-low RST output with internal 50 kΩ pull-up, operating voltage range 1.65 V to 5.5 V, and ultra-low 1.5 µA supply current. Used in smartphones and e-readers to prevent spurious resets during brief button presses.

For engineers reviewing the STM6524ALABDL6F datasheet, STM6524ALABDL6F pinout, STM6524ALABDL6F application, or STM6524ALABDL6F equivalent, this page delivers verified timing parameters, confirmed UDFN6 package mapping, validated dual-input reset logic behavior, and real-world use cases requiring glitch-immune, push-button–triggered hard reset with guaranteed pulse width.

Technical Context

The STM6524ALABDL6F implements dual active-low Smart Reset™ inputs (SR0, SR1) that must both be asserted simultaneously for the full tSRC = 6.0 s (typ.) before asserting RST. Its reset output is open-drain active-low with integrated 50 kΩ pull-up resistor and factory-fixed tREC = 360 ms pulse width - meaning RST remains low for exactly 360 ms regardless of button release timing.

It operates across –40 °C to +85 °C, draws only 1.5 µA at VCC = 5.0 V in idle state, ignores inputs below 1.575 V (deasserting RST down to 1.0 V), and supports test mode entry via overvoltage on SR0 (VTEST = VCC + 0.9 to +1.4 V), enabling rapid functional validation without power cycling.

Key Specifications

Pinout & Package

Package: UDFN6 (1.6 mm × 1.3 mm × 0.55 mm, 0.40 mm pitch), ECOPACK®2 RoHS-compliant and halogen-free.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-input delayed reset applications.

Compared with STM6524ALABDL6F, the ALARDL6F offers flexible reset timing but lacks guaranteed pulse width, while APABDL6F increases delay margin without altering reset duration - making STM6524ALABDL6F optimal for balanced responsiveness and robustness in mainstream consumer portables.

Availability

STM6524ALABDL6F is available at Aetrix Electronics and suitable for smartphone system reset, e-reader power-on recovery, and portable navigation device applications requiring stable component supply, guaranteed 360 ms reset pulse width, and ultra-low power consumption.

Supply support for STM6524ALABDL6F includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, digital, and mixed-signal ICs for industrial, automotive, and consumer markets.

The STM65xx Smart Reset™ family targets portable electronics requiring robust, low-power, push-button–initiated system recovery - emphasizing glitch immunity, programmable timing, and minimal external components.

FAQ

What is the exact tREC value for STM6524ALABDL6F, and how is it enforced?

The STM6524ALABDL6F has a factory-programmed tREC of 360 ms (typ.), guaranteed across –40 °C to +85 °C and 1.65 V to 5.5 V VCC. This pulse width is generated by an internal timer and is independent of SR0/SR1 release timing - RST remains low for precisely 360 ms after tSRC expiry, then deasserts automatically.

Does STM6524ALABDL6F require external pull-up resistors on SR0/SR1 inputs?

No. The STM6524ALABDL6F includes internal pull-up resistors on both SR0 and SR1 inputs, as confirmed in Table 1 and Section 2.3 of the datasheet. External pull-ups are unnecessary unless higher noise immunity is required in exceptionally noisy environments.

How does the test mode function, and what is its practical utility?

Test mode is entered by applying ≥ VCC + 0.9 V to SR0, causing RST to pulse low for tSRC-INI = 42 ms (typ.). This provides immediate visual/oscilloscope feedback that the device is operational. It enables rapid in-circuit validation without power cycling - especially valuable during board bring-up and field service diagnostics.

Can STM6524ALABDL6F be used in systems with 1.8 V microcontrollers?

Yes. The STM6524ALABDL6F operates down to 1.65 V VCC and specifies VOL ≤ 0.3 V at VCC ≥ 1.65 V sinking 1 mA - fully compatible with 1.8 V logic thresholds. Its RST output remains valid and noise-immune across the entire 1.65–5.5 V range, including partial brownout conditions down to 1.0 V.